In which of the following options the order arrangement does not agree with the variation of property indicated against it?

Options

A. `Li lt Na lt K lt Rb` (increasing melallic radius)
B. `Al^(3+) lt Mg^(2+) lt Na^(+) lt F^(-)` (increasing ionic size)
C. `B lt C lt N lt O` (increasing first ionization enthalpy)
D. `I lt Br lt C l lt F`(increasing electron gain enthalpy)

Answer

C, D

Explanation

Correct order of increasing `1^(st)` I.Egt `rarr BltCltOltN`
Correct order of increasing electron gain
Enythalpy `rarrIltBrltFltCl`(in magnitude)
Value (in `kJ//mol)rarr 296,325,333,349`
I.E. Of `NltO` as it has half-filled electronic configuration.